Failed to call service light/turn_on with unsupported operad type(s)

Configuration
1

Learning Home assistant, in pursuit to create my own MQTT controlled light, with json schema, to minimize number of messages.

My test auto discovery message looks like:

{
    "~": "ha/tm/8R-1L-1TS-123498DB/rgbstrip/04",
    "name": "RGB strip 04",
    "object_id": "rgbstrip_04",
    "unique_id": "rgbstrip_123498DB_04",
    "device_class": "light",
    "schema": "json",
    "cmd_t": "~/c/cmd",
    "stat_t": "~/s/stat",
    "optimistic": true, /* set to true for test purposes only */
    "on_command_type": "first",
    "brightness": true,
    "white": true,
    "supported_color_modes": [
        "rgb","hs","xy","white","color_temp"
    ],
    "effect": true,
    "effect_list": [
        "Static",
        "Blink",
    ],
    "device": {
        "identifiers": [
            "switch_unit_DEADBEEF"
        ]
    }
}

Which properly generates new entity and displays controls:

image
image557×779 18.4 KB

They all work properly, except when I click to W to set white color, then I get:

image

When I select RGB color, I properly get MQTT message similar to:

{
  "state": "ON",
  "color": {
    "r": 81,
    "g": 159,
    "b": 255
  }
}

What am I doing wrong that white doesn’t work?

2

Found the issue. It is necessary to first set some brightness with the frontend slider, only then pressing “white” button will properly transmit message to the light.

Strange…